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Summary: Inherited Constants | Ctors | Methods | Inherited Methods

# HeaderViewListAdapter

`public class HeaderViewListAdapter`
`extends Object` `implements WrapperListAdapter, Filterable`

java.lang.Object
↳ | android.widget.HeaderViewListAdapter

ListAdapter used when a ListView has header views. This ListAdapter wraps another one and also keeps track of the header views and their associated data objects.

This is intended as a base class; you will probably not need to use this class directly in your own code.

## Summary

### Inherited constants
From interface `android.widget.Adapter`
`int` | `IGNORE_ITEM_VIEW_TYPE` An item view type that causes the `AdapterView` to ignore the item view.
`int` | `NO_SELECTION`

### Public constructors
`HeaderViewListAdapter(ArrayList<ListView.FixedViewInfo> headerViewInfos, ArrayList<ListView.FixedViewInfo> footerViewInfos, ListAdapter adapter)`

### Public methods
`boolean` | `areAllItemsEnabled()` Indicates whether all the items in this adapter are enabled.
`int` | `getCount()` How many items are in the data set represented by this Adapter.
`Filter` | `getFilter()` Returns a filter that can be used to constrain data with a filtering pattern.
`int` | `getFootersCount()`
`int` | `getHeadersCount()`
`Object` | `getItem(int position)` Get the data item associated with the specified position in the data set.
`long` | `getItemId(int position)` Get the row id associated with the specified position in the list.
`int` | `getItemViewType(int position)` Get the type of View that will be created by `getView(int, View, ViewGroup)` for the specified item.
`View` | `getView(int position, View convertView, ViewGroup parent)` Get a View that displays the data at the specified position in the data set.
`int` | `getViewTypeCount()` Returns the number of types of Views that will be created by `getView(int, View, ViewGroup)`.
`ListAdapter` | `getWrappedAdapter()` Returns the adapter wrapped by this list adapter.
`boolean` | `hasStableIds()` Indicates whether the item ids are stable across changes to the underlying data.
`boolean` | `isEmpty()`
`boolean` | `isEnabled(int position)` Returns true if the item at the specified position is not a separator.
`void` | `registerDataSetObserver(DataSetObserver observer)` Register an observer that is called when changes happen to the data used by this adapter.
`boolean` | `removeFooter(View v)`
`boolean` | `removeHeader(View v)`
`void` | `unregisterDataSetObserver(DataSetObserver observer)` Unregister an observer that has previously been registered with this adapter via `registerDataSetObserver(DataSetObserver)`.

### Inherited methods
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.
From interface `android.widget.WrapperListAdapter`
`abstract ListAdapter` | `getWrappedAdapter()` Returns the adapter wrapped by this list adapter.
From interface `android.widget.Filterable`
`abstract Filter` | `getFilter()` Returns a filter that can be used to constrain data with a filtering pattern.
From interface `android.widget.ListAdapter`
`abstract boolean` | `areAllItemsEnabled()` Indicates whether all the items in this adapter are enabled.
`abstract boolean` | `isEnabled(int position)` Returns true if the item at the specified position is not a separator.
From interface `android.widget.Adapter`
`default CharSequence[]` | `getAutofillOptions()` Gets a string representation of the adapter data that can help `AutofillService` autofill the view backed by the adapter.
`abstract int` | `getCount()` How many items are in the data set represented by this Adapter.
`abstract Object` | `getItem(int position)` Get the data item associated with the specified position in the data set.
`abstract long` | `getItemId(int position)` Get the row id associated with the specified position in the list.
`abstract int` | `getItemViewType(int position)` Get the type of View that will be created by `getView(int, View, ViewGroup)` for the specified item.
`abstract View` | `getView(int position, View convertView, ViewGroup parent)` Get a View that displays the data at the specified position in the data set.
`abstract int` | `getViewTypeCount()` Returns the number of types of Views that will be created by `getView(int, View, ViewGroup)`.
`abstract boolean` | `hasStableIds()` Indicates whether the item ids are stable across changes to the underlying data.
`abstract boolean` | `isEmpty()`
`abstract void` | `registerDataSetObserver(DataSetObserver observer)` Register an observer that is called when changes happen to the data used by this adapter.
`abstract void` | `unregisterDataSetObserver(DataSetObserver observer)` Unregister an observer that has previously been registered with this adapter via `registerDataSetObserver(DataSetObserver)`.

## Public constructors

### HeaderViewListAdapter

    public HeaderViewListAdapter (ArrayList<ListView.FixedViewInfo> headerViewInfos,
                    ArrayList<ListView.FixedViewInfo> footerViewInfos,
                    ListAdapter adapter)

Parameters
`headerViewInfos` | `ArrayList`
`footerViewInfos` | `ArrayList`
`adapter` | `ListAdapter`

## Public methods

### areAllItemsEnabled

    public boolean areAllItemsEnabled ()

Indicates whether all the items in this adapter are enabled. If the value returned by this method changes over time, there is no guarantee it will take effect. If true, it means all items are selectable and clickable (there is no separator.)

Returns
`boolean` | True if all items are enabled, false otherwise.

### getCount

    public int getCount ()

How many items are in the data set represented by this Adapter.

Returns
`int` | Count of items.

### getFilter

    public Filter getFilter ()

Returns a filter that can be used to constrain data with a filtering pattern.

This method is usually implemented by `Adapter` classes.

Returns
`Filter` | a filter used to constrain data

### getFootersCount

    public int getFootersCount ()

Returns
`int` |

### getHeadersCount

    public int getHeadersCount ()

Returns
`int` |

### getItem

    public Object getItem (int position)

Get the data item associated with the specified position in the data set.

Parameters
`position` | `int`: Position of the item whose data we want within the adapter's data set.

Returns
`Object` | The data at the specified position.

### getItemId

    public long getItemId (int position)

Get the row id associated with the specified position in the list.

Parameters
`position` | `int`: The position of the item within the adapter's data set whose row id we want.

Returns
`long` | The id of the item at the specified position.

### getItemViewType

    public int getItemViewType (int position)

Get the type of View that will be created by `getView(int, View, ViewGroup)` for the specified item.

Parameters
`position` | `int`: The position of the item within the adapter's data set whose view type we want.

Returns
`int` | An integer representing the type of View. Two views should share the same type if one can be converted to the other in `getView(int, View, ViewGroup)`. Note: Integers must be in the range 0 to `getViewTypeCount()` - 1. `IGNORE_ITEM_VIEW_TYPE` can also be returned.

### getView

    public View getView (int position,
                    View convertView,
                    ViewGroup parent)

Get a View that displays the data at the specified position in the data set. You can either create a View manually or inflate it from an XML layout file. When the View is inflated, the parent View (GridView, ListView...) will apply default layout parameters unless you use `LayoutInflater.inflate(int, android.view.ViewGroup, boolean)` to specify a root view and to prevent attachment to the root.

Parameters
`position` | `int`: The position of the item within the adapter's data set of the item whose view we want.
`convertView` | `View`: The old view to reuse, if possible. Note: You should check that this view is non-null and of an appropriate type before using. If it is not possible to convert this view to display the correct data, this method can create a new view. Heterogeneous lists can specify their number of view types, so that this View is always of the right type (see `getViewTypeCount()` and `getItemViewType(int)`).
`parent` | `ViewGroup`: The parent that this view will eventually be attached to

Returns
`View` | A View corresponding to the data at the specified position.

### getViewTypeCount

    public int getViewTypeCount ()

Returns the number of types of Views that will be created by `getView(int, View, ViewGroup)`. Each type represents a set of views that can be converted in `getView(int, View, ViewGroup)`. If the adapter always returns the same type of View for all items, this method should return 1.

This method will only be called when the adapter is set on the `AdapterView`.

Returns
`int` | The number of types of Views that will be created by this adapter

### getWrappedAdapter

    public ListAdapter getWrappedAdapter ()

Returns the adapter wrapped by this list adapter.

Returns
`ListAdapter` | The `ListAdapter` wrapped by this adapter.

### hasStableIds

    public boolean hasStableIds ()

Indicates whether the item ids are stable across changes to the underlying data.

Returns
`boolean` | True if the same id always refers to the same object.

### isEmpty

    public boolean isEmpty ()

Returns
`boolean` |

### isEnabled

    public boolean isEnabled (int position)

Returns true if the item at the specified position is not a separator. (A separator is a non-selectable, non-clickable item). The result is unspecified if position is invalid. An `ArrayIndexOutOfBoundsException` should be thrown in that case for fast failure.

Parameters
`position` | `int`: Index of the item

Returns
`boolean` | True if the item is not a separator

### registerDataSetObserver

    public void registerDataSetObserver (DataSetObserver observer)

Register an observer that is called when changes happen to the data used by this adapter.

Parameters
`observer` | `DataSetObserver`: the object that gets notified when the data set changes.

### removeFooter

    public boolean removeFooter (View v)

Parameters
`v` | `View`

Returns
`boolean` |

### removeHeader

    public boolean removeHeader (View v)

Parameters
`v` | `View`

Returns
`boolean` |

### unregisterDataSetObserver

    public void unregisterDataSetObserver (DataSetObserver observer)

Unregister an observer that has previously been registered with this adapter via `registerDataSetObserver(DataSetObserver)`.

Parameters
`observer` | `DataSetObserver`: the object to unregister.

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